Table 1.
Summary of the initial parameters and physics assumptions of our models.
| Single-star model | mi (M⊙) | XH (t = ta) | log Ṁacc,i (M⊙/yr) | Ṁacc | Accrertion termination condition |
|---|---|---|---|---|---|
| Set I | 4–20, ΔM = 2 | 0.5 | −4.3 to −2.2, in steps of 0.1 | Constant | Critical rotation |
| Set II | 8 | 0.5 | −3.0 | Rotation-limited | log Ṁacc drops below certain thresholds |
| Set III | 8 | 0.3 | −3.0 | Rotation-limited | log Ṁacc drops below certain thresholds |
| Set IV | 12 | 0.5 | −3.3 and −3.0 | Not rotation-limited | Mass reaches 20 M⊙ |
| Binary model | Initial binary parameters | αSC | jacc | Rotation-limited Ṁacc? | Tayler–Spruit dynamo |
| Model I | (20 + 8) M⊙, 150 d | 1 | jkep | Yes | Yes |
| Model II | (20 + 8) M⊙, 150 d | 1 | jaccretor | Yes | Yes |
| Model III | (20 + 8) M⊙, 150 d | 100 | jkep | Yes | Yes |
| Model IV | (20 + 8) M⊙, 150 d | 1 | jkep when ω < ωcrit | No | Yes |
| 0.1 jkep when ω = ωcrit | |||||
| Model V | (20 + 8) M⊙, 150 d | 1 | jkep | Yes | No |
Notes. mi: initial mass; XH: central hydrogen mass fraction; ta: time when accretion begins; Ṁacc,i: initial mass accretion rate; αSC: semiconvective mixing parameter; jacc: specific angular momentum accreted by the star; jkep: Keplerian specific angular momentum at the accretor’s surface; jaccretor: specific angular momentum at the surface of the accretor. ω and ωcrit: surface angular velocity and critical angular velocity, respectively.
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